Keypoint Detection and Local Feature Matching for Textured 3D Face Recognition

In this study we concentrate on qualitative topological analysis of the local behavior of the space of natural images. To this end, we use a space of 3 by 3 high-contrast patches ℳ. We develop a theoretical model for the high-density 2-dimensional submanifold of ℳ showing that it has the topology of the Klein bottle. Using our topological software package PLEX we experimentally verify our theoretical conclusions. We use polynomial representation to give coordinatization to various subspaces of ℳ. We find the best-fitting embedding of the Klein bottle into the ambient space of ℳ. Our results are currently being used in developing a compression algorithm based on a Klein bottle dictionary.     

Characterization of the Temperature Dependence of the Pressure Coefficients of n- and p-Type Silicon Using Hydrostatic Testing

Piezoresistive stress sensors on the (111) surface of silicon offer the unique ability to measure the complete stress state at a point in the (111) material. However, four-point bending or wafer-level calibration methods can measure only four of the six piezoresistive coefficients for p- and n-type resistors required for application of these sensors. In this work, a hydrostatic test method has been developed in which a high-capacity pressure vessel is used to apply a triaxial load to a single die over the -25degC to+100 degC temperature range. The slopes of the adjusted resistance change versus pressure plots yield pressure coefficients for p- and n-type silicon that provide the additional information necessary to fully determine the complete set of piezoresistive coefficients.     

梯级水电站群保证出力优化计算的一个直接算法

梯级水电站群保证出力优化计算问题是一个有非线性约束的maxmin问题max{M_f(X)|X∈G={X|g_j(x)≤0,j=1,…,N,X∈R~n}),其中M_f(X)=min{f_1(X),…,f_K(X)}。本文在文[1]的基础上,提出一个求解该问题的直接算法。所给出的算法保证了迭代序列{X~((i))_(i=1)~∞的可行性,即有{X~((i))_(i=1)~∞(?)G。本文最后计算了一个梯级水电站群(包含5个水电站)的保证出力优化的实例,计算结果表明该算法是有效的。     

活性炭对氢气中O_2与N_2的吸附性能研究

研究测定了温度为77 K,压力0.1 MPa,流量分别为5、8、10 L·min-1时活性炭对O2、N2的饱和吸附量,考察了O2与N2双组分杂质在氢气中共存对活性炭吸附行为的影响,并采用Fick扩散模型分别对O2和N2在活性炭内的扩散行为进行了分析,求出了实验条件下O2与N2在活性炭内的扩散系数,确定了二者在活性炭内的扩散均属于晶体扩散。     

华鑫展示中心,上海,中国

<正>华鑫办公集群位于桂林路西,其入口南侧是一块绿地。这块绿地面向城市千道的开放属性,以及其中的6棵大香樟,成为了设计的出发点,并由此确立了展示中心的两个基本策略:(1)建筑主体抬高至二层,最大化开放地面的绿化空间。(2)保留6株大树的同时,在建筑与树之间建立亲密的互动关系。最终完成的建筑由4座独立的悬浮体串联而成。底层的10片混凝土墙支撑着上部结构,其表面包敷的镜面不锈钢映射着外部的绿化环境,从而在消解自身的同时,凸显了地面层的开放和上部的悬浮     

Shock to Initiation Characters of Heated Explosives with Different Confinement

Heated explosives might undergo thermal expansion and/or phase transition, which affects their shock sensitivity. Therefore, investigating the effect of temperature on the shock initiation properties of explosives would provide valuable safety guidelines for their transportation and handling. In this study, an experimental detonation device that achieved homogeneous heating of the explosive test sample while avoiding unintended heat transfer to the donor was designed and constructed. The device allowed to perform flyer impact tests on PBXC10 at different temperatures and using different confinement conditions. The generated experimental pressure history curves were used to calculate the parameters of the I&G model and determine their relationships with the sample temperature. The fully parameterized I&G model enabled predicting the shock initiation properties of PBXC10 at temperatures where experimental data were unavailable. It was concluded that increased sample temperatures would lead to a shorter run distance to detonation, faster propagation of the detonation wave and enhanced shock sensitivity of the explosive. It was also demonstrated that unconfined PBXC10 exhibited significantly greater shock sensitivity compared to its partially and completely confined counterparts.     

浦东国际机场二期物流仓库屋面系统建筑构造设计

结合浦东国际机场二期物流仓库工程建设和管理实践,介绍轻钢建筑屋面系统针对抗渗漏、抗风等方面的构造设计重点和要点,包括屋面系统、墙面系统构造、防腐与防火及排烟设计,通过对该屋面系统的深化设计,确保工程质量优异。     

一种片内硬件调试支持单元设计

该模块通过AHB总线接口监听总线通信内容并将其实时记录于缓冲器中,用户可以通过该缓冲域观察系统运转;它支持在断点/观察点以及处理器陷阱等条件下通过挂起处理器进行系统诊断,同时其内部多级地址译码机制可以对所有片上控制存储单元进行定位,方便用户进行调试。通过专用的调试通信链路,用户可以方便地对嵌入式系统进行远程调试。     

Increasing the toughness of nylon 12 by the incorporation of functionalized graphene

The effect of functionalized graphene (FG) on the mechanical properties, especially toughness, of nylon12 was investigated. The results revealed that the incorporation of a very small amount (about 0.6 wt%) of the FG caused a significant improvement in ultimate tensile strength, elongation, impact strength and toughness. With 0.6 wt% FG ultimate tensile strength and elongation at break of the nylon 12 are improved by ∼35% and ∼200%, respectively. The K_Ic of the nylon 12 is ∼1.28 MPa m^0.5 and the incorporation of 0.6 wt% FG causes a significant increase of 72% (∼2.2 MPa m^0.5). 0.6 wt% FG also causes a significant improvement of 175% in impact failure energy of the nylon 12. The incorporation of FG resulted in an increase in amount of γ-phase of nylon12 which could be the direct reason for the increase of toughness.